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CVE-2020-25613 — Vulnerability in webrick — CVE Details

HIGH

WEBRick vulnerable to HTTP Request/Response Smuggling

Published May 24, 2022Updated May 29, 2025Source: osv

Summary

An issue was discovered in Ruby through 2.5.8, 2.6.x through 2.6.6, and 2.7.x through 2.7.1. WEBrick, a simple HTTP server bundled with Ruby, had not checked the transfer-encoding header value rigorously. An attacker may potentially exploit this issue to bypass a reverse proxy (which also has a poor header check), which may lead to an HTTP Request Smuggling attack.

Advisory Timeline

  • First published May 24, 2022 (1602 days ago).
  • Last revised May 29, 2025 — 1101 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Bundler
Update webrick to 1.6.1 or later
gem install webrick -v 1.6.1
Bundler
Update webrick to 1.5.1 or later
gem install webrick -v 1.5.1
Bundler
Update webrick to 1.4.4 or later
gem install webrick -v 1.4.4

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (3)

Affects 1 ecosystem: rubygems (1).

PackageEcosystemAffectedFixed In
webrick
rubygems
1.6.01.6.1
webrick
rubygems
1.5.01.5.1
webrick
rubygems
1.3.1, 1.4.0, 1.4.0.beta1, 1.4.1 (+2 more)1.4.4

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 7.5 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

References

Frequently Asked Questions

What is CVE-2020-25613?
WEBRick vulnerable to HTTP Request/Response Smuggling This vulnerability has been assigned a severity rating of HIGH (CVSS score: 7.5/10).
How do I check if my project is affected by CVE-2020-25613?
CVE-2020-25613 affects webrick. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2020-25613 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
7.5

High exploitability or significant impact. Prioritize remediation within days.

Also Known As

GHSA-gwfg-cqmg-cf8f
BIT-ruby-2020-25613
BIT-ruby-min-2020-25613

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